ALLIS. Vor xt 
580 [ 
of that muscle. Their further consideration is not necessary. 
The first and second divisions of the levator either disappear 
entirely or fuse with the adductor proper of Amia to form the 
main portion of that muscle in teleosts. This McMurrich 
(No. 76, p. 127) has already suggested, the adductor in teleosts 
being, in his opinion, equivalent to that of Amia plus the leva- 
tor maxillae superioris of selachians, that is, plus the second, 
or the first and second, divisions of the muscle of Amia. This 
is indicated by certain features in the innervation of the 
muscle, such as the innervation of the superficial portion of 
the adductor in Amiurus by a special branch of the trigeminus, 
the branch arising proximal to the branch that supplies the 
deeper portion of the muscle (No. 75, p. 313), and the innerva- 
tion of a part of the adductor in Silurus, Salmo, and Gadus by 
branches arising directly from the ganglion of the nervus tri- 
geminus (No. 116, p. 45). The innervation, in Amiurus (No. 
132, p. 368), of the levator arcus palatini and dilatator operculi 
by certain fibres arising from a superficial branch of the r. ad 
musc. adductorem mandibulae, has no parallel in Amia. 
The deeper part, 43, of the adductor in Cyprinus is inserted 
mainly by tendon on the inner side of the dentary, but in part 
it passes into a short, flat muscle Aa, and is inserted at the hind 
end of Meckel’s cartilage and on the adjoining parts of the den- 
tary. In Barbus, A; is inserted mainly by tendon at the hind 
end of Meckel’s cartilage, but in part it becomes muscular again 
and is inserted farther forward on the inner surface of the den- 
tary. In Perca and in Esox the muscle Aw” has entirely dis- 
appeared, and A; is inserted wholly by tendon at the hind end 
of Meckel’s cartilage, this manner of insertion being doubtless 
determined by the preéxisting tendons of Zsm? and Lsm3. In 
Amiurus also the fibres of A, have followed apparently the 
tendons of Lsz3, but in the opposite direction, that is, toward 
the origin of the muscle, A; being inserted by tendon at the 
base of the maxilla. The tendon is split near its insertion 
and the rr. maxillaris sup. trigemini and buccalis facialis run 
forward between the two ends (No. 75, p. 314 and No. 132, 
p. 368), as they do between the two heads of Zms3, or between 
Lms3 and Lms* in Amia. 
